William sawyee



W. SA'WYBR Electrio Lamp.

No. 227,390. Paten t ed May 11,1880.

-PETERS. PNDTO-LITHOGRAPH ER, WASHINGTON, D C.

UNITED STATES PATENT OFFICE.

WILLIAM SAWYER, OF NEW YORK, N. Y., ASSIGNOR TO THE EASTERN ELEC. TRICMANUFACTURING COMPANY, OF MIDDLETOWN, CONN.

ELECTRIC LAMP.

SPECIFICATION formingpart of Letters Patent No. 227,390, dated May 11,1880.

Application filed January 17, 1880.

To all whom it may concern:

Be it known that I, WILLIAM SAWYER, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Electric Lamps, ofwhich the following is a full, clear, and exact description.

Myinvention relates to that method of elecro trio lighting in which apencil of carbon hermetically sealed in a glass globe charged withnitrogen gas is rendered incandescent by the passage of the electriccurrent, and is more particularly an improvement upon the electriclampinvention of Mr. W. E. Sawyer, Letters Patent of the United States No.219,771, dated September 16, 187 9. I have so remodeled the lamp of Mr.W. E. Sawyers invention that the costly and complicated electromagneticfeeding device shown and described in the Letters Patent referred to isdispensed with, and a simple, cheap, and effective lighting deviceproduced.

Referring to the drawing accompanying and constituting a part of thisspecification, the figure is a sectional view of the feedingmechanism ofmy lamp.

C is the thumb-nut of the feeding-shaft B. This shaft passes from oneside of the base A,

0 as shown, into and across a sunken space, H, in the base, the finesteel or copper wire X, by which the carbon is fed upward, winding upupon the shaft.

The outward annular space about the shaft B, I pack as follows: First,cork I, fitting closely to the shaft B and the end of the annular space;second, withsoft-rubber washers J; third, with iron washers L; and,lastly, with soft-rubber washers J. I next set down 0 upon the same withgreat force by means of screw-plug D, in which the shaft B closely fits.

The joint thus madeis practically herm etical, butas a further safeguardI pour quicksilver F into the space about the washers L, thus 5 forminga hydraulic joint. To do this I provide the base with a hole, E, whichmay be closed up with cement, or, as I prefer, with an iron screw.

Having thus fully described my invention, what I claim as such, anddesire to secure by Letters Patent, is-

1. In an electric lamp operating by incandescence, the combination ofacom pressed cork, rubber, or other elastic paekin g with the shaft B andquicksilver surrounding the packing, as and for the purpose set forth.

2. The combination of the shaft B, cup A, ring-packing, quicksilver F,surrounding the packing, and screw-nut D, as and for the pur- 6o poseset forth.

3. The packing of the shaft B, consisting of the cork 1, rubber orelastic packing J, and metal L, combined substantially as described.

4. The packing of the shaft B, consisting of the cork 1, rubber or otherelastic packing J, and metal L, in combination with the quicksilver F,substantially as described.

5. The packing of the shaft B, consisting of the cork 1, rubber or otherelastic packing J, and metal L, in combination with the quicksilver Fand screw-nut D, substantially as described.

6. The cup A, having the recess H,in combination with the shaft B andwire X, as and for the purpose set forth.

WM. SAWYER.

Witnesses:

WM. G. OONKLIN, ADOLPH FRANKIE.

